package com.ywq.app.biz.impl.security;

import java.util.Collection;
import java.util.Iterator;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.SecurityConfig;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;

public class MyAccessDecisionManager implements AccessDecisionManager {

	public void decide(Authentication authentication, Object secureObject,
			Collection<ConfigAttribute> configAttributes)
			throws AccessDeniedException, InsufficientAuthenticationException {
		if (null == configAttributes) {
			return;
		}

		Iterator<ConfigAttribute> ite = configAttributes.iterator();
		while (ite.hasNext()) {
			ConfigAttribute ca = ite.next();
			String needRole = ((SecurityConfig) ca).getAttribute();
			// ga 为用户所被赋予的权限。 needRole 为访问相应的资源应该具有的权限。
			for (GrantedAuthority ga : authentication.getAuthorities()) {
				if (needRole.trim().equals(ga.getAuthority().trim())) {
					return;
				}
			}
		}
		throw new AccessDeniedException(String.valueOf(secureObject));
	}

	public boolean supports(ConfigAttribute attribute) {
		return true;
	}

	public boolean supports(Class<?> clazz) {
		return true;
	}

}
